什么是插件及其在 mysql 中的工作原理？
What is plugins and how it is work in mysql?
我正在 MySql 官方网站 (https://dev.mysql.com/doc/refman/5.1/en/partitioning.html) 探索分区。
在第一页，我找到了 plugins。
mysql> show plugins;
+----------------------------+----------+--------------------+---------+---------+
| Name | Status | Type | Library | License |
+----------------------------+----------+--------------------+---------+---------+
| binlog | ACTIVE | STORAGE ENGINE | NULL | GPL |
| mysql_native_password | ACTIVE | AUTHENTICATION | NULL | GPL |
| mysql_old_password | ACTIVE | AUTHENTICATION | NULL | GPL |
| sha256_password | ACTIVE | AUTHENTICATION | NULL | GPL |
| MyISAM | ACTIVE | STORAGE ENGINE | NULL | GPL |
| MRG_MYISAM | ACTIVE | STORAGE ENGINE | NULL | GPL |
| MEMORY | ACTIVE | STORAGE ENGINE | NULL | GPL |
| CSV | ACTIVE | STORAGE ENGINE | NULL | GPL |
| InnoDB | ACTIVE | STORAGE ENGINE | NULL | GPL |
| INNODB_TRX | ACTIVE | INFORMATION SCHEMA | NULL | GPL |
| INNODB_LOCKS | ACTIVE | INFORMATION SCHEMA | NULL | GPL |
| INNODB_LOCK_WAITS | ACTIVE | INFORMATION SCHEMA | NULL | GPL |
| INNODB_CMP | ACTIVE | INFORMATION SCHEMA | NULL | GPL |
| INNODB_CMP_RESET | ACTIVE | INFORMATION SCHEMA | NULL | GPL |
| INNODB_CMPMEM | ACTIVE | INFORMATION SCHEMA | NULL | GPL |
| INNODB_CMPMEM_RESET | ACTIVE | INFORMATION SCHEMA | NULL | GPL |
| INNODB_CMP_PER_INDEX | ACTIVE | INFORMATION SCHEMA | NULL | GPL |
| INNODB_CMP_PER_INDEX_RESET | ACTIVE | INFORMATION SCHEMA | NULL | GPL |
| INNODB_BUFFER_PAGE | ACTIVE | INFORMATION SCHEMA | NULL | GPL |
| INNODB_BUFFER_PAGE_LRU | ACTIVE | INFORMATION SCHEMA | NULL | GPL |
| INNODB_BUFFER_POOL_STATS | ACTIVE | INFORMATION SCHEMA | NULL | GPL |
| INNODB_METRICS | ACTIVE | INFORMATION SCHEMA | NULL | GPL |
| INNODB_FT_DEFAULT_STOPWORD | ACTIVE | INFORMATION SCHEMA | NULL | GPL |
| INNODB_FT_DELETED | ACTIVE | INFORMATION SCHEMA | NULL | GPL |
| INNODB_FT_BEING_DELETED | ACTIVE | INFORMATION SCHEMA | NULL | GPL |
| INNODB_FT_CONFIG | ACTIVE | INFORMATION SCHEMA | NULL | GPL |
| INNODB_FT_INDEX_CACHE | ACTIVE | INFORMATION SCHEMA | NULL | GPL |
| INNODB_FT_INDEX_TABLE | ACTIVE | INFORMATION SCHEMA | NULL | GPL |
| INNODB_SYS_TABLES | ACTIVE | INFORMATION SCHEMA | NULL | GPL |
| INNODB_SYS_TABLESTATS | ACTIVE | INFORMATION SCHEMA | NULL | GPL |
| INNODB_SYS_INDEXES | ACTIVE | INFORMATION SCHEMA | NULL | GPL |
| INNODB_SYS_COLUMNS | ACTIVE | INFORMATION SCHEMA | NULL | GPL |
| INNODB_SYS_FIELDS | ACTIVE | INFORMATION SCHEMA | NULL | GPL |
| INNODB_SYS_FOREIGN | ACTIVE | INFORMATION SCHEMA | NULL | GPL |
| INNODB_SYS_FOREIGN_COLS | ACTIVE | INFORMATION SCHEMA | NULL | GPL |
| INNODB_SYS_TABLESPACES | ACTIVE | INFORMATION SCHEMA | NULL | GPL |
| INNODB_SYS_DATAFILES | ACTIVE | INFORMATION SCHEMA | NULL | GPL |
| PERFORMANCE_SCHEMA | ACTIVE | STORAGE ENGINE | NULL | GPL |
| FEDERATED | DISABLED | STORAGE ENGINE | NULL | GPL |
| ARCHIVE | ACTIVE | STORAGE ENGINE | NULL | GPL |
| BLACKHOLE | ACTIVE | STORAGE ENGINE | NULL | GPL |
| partition | ACTIVE | STORAGE ENGINE | NULL | GPL |
+----------------------------+----------+--------------------+---------+---------+
42 rows in set (0.05 sec)
心里有一些疑问
- 什么是
plugins？
- 工作情况如何？
MySql 有多少插件可用？- 我可以添加其他
plugins 吗？
- 如果我可以添加那么如何添加？
这里是我安装的插件列表。还有很多。他们可以做很多事情。它们可以是存储引擎或处理用户功能或调度程序或......
因此可以通过正常的 SQL and and and.
直接读取或写入 CSV 或 JSON 文件
在这里你可以找到一些Informations
MariaDB > SHOW PLUGINS;
+-----------------------------+--------+--------------------+------------------------+---------+
| Name | Status | Type | Library | License |
+-----------------------------+--------+--------------------+------------------------+---------+
| binlog | ACTIVE | STORAGE ENGINE | NULL | GPL |
| mysql_native_password | ACTIVE | AUTHENTICATION | NULL | GPL |
| mysql_old_password | ACTIVE | AUTHENTICATION | NULL | GPL |
| CSV | ACTIVE | STORAGE ENGINE | NULL | GPL |
| MEMORY | ACTIVE | STORAGE ENGINE | NULL | GPL |
| MyISAM | ACTIVE | STORAGE ENGINE | NULL | GPL |
| MRG_MyISAM | ACTIVE | STORAGE ENGINE | NULL | GPL |
| Aria | ACTIVE | STORAGE ENGINE | NULL | GPL |
| PERFORMANCE_SCHEMA | ACTIVE | STORAGE ENGINE | NULL | GPL |
| InnoDB | ACTIVE | STORAGE ENGINE | NULL | GPL |
| XTRADB_READ_VIEW | ACTIVE | INFORMATION SCHEMA | NULL | GPL |
| XTRADB_INTERNAL_HASH_TABLES | ACTIVE | INFORMATION SCHEMA | NULL | GPL |
| XTRADB_RSEG | ACTIVE | INFORMATION SCHEMA | NULL | GPL |
| INNODB_TRX | ACTIVE | INFORMATION SCHEMA | NULL | GPL |
| INNODB_LOCKS | ACTIVE | INFORMATION SCHEMA | NULL | GPL |
| INNODB_LOCK_WAITS | ACTIVE | INFORMATION SCHEMA | NULL | GPL |
| INNODB_CMP | ACTIVE | INFORMATION SCHEMA | NULL | GPL |
| INNODB_CMP_RESET | ACTIVE | INFORMATION SCHEMA | NULL | GPL |
| INNODB_CMPMEM | ACTIVE | INFORMATION SCHEMA | NULL | GPL |
| INNODB_CMPMEM_RESET | ACTIVE | INFORMATION SCHEMA | NULL | GPL |
| INNODB_CMP_PER_INDEX | ACTIVE | INFORMATION SCHEMA | NULL | GPL |
| INNODB_CMP_PER_INDEX_RESET | ACTIVE | INFORMATION SCHEMA | NULL | GPL |
| INNODB_BUFFER_PAGE | ACTIVE | INFORMATION SCHEMA | NULL | GPL |
| INNODB_BUFFER_PAGE_LRU | ACTIVE | INFORMATION SCHEMA | NULL | GPL |
| INNODB_BUFFER_POOL_STATS | ACTIVE | INFORMATION SCHEMA | NULL | GPL |
| INNODB_METRICS | ACTIVE | INFORMATION SCHEMA | NULL | GPL |
| INNODB_FT_DEFAULT_STOPWORD | ACTIVE | INFORMATION SCHEMA | NULL | GPL |
| INNODB_FT_DELETED | ACTIVE | INFORMATION SCHEMA | NULL | GPL |
| INNODB_FT_BEING_DELETED | ACTIVE | INFORMATION SCHEMA | NULL | GPL |
| INNODB_FT_CONFIG | ACTIVE | INFORMATION SCHEMA | NULL | GPL |
| INNODB_FT_INDEX_CACHE | ACTIVE | INFORMATION SCHEMA | NULL | GPL |
| INNODB_FT_INDEX_TABLE | ACTIVE | INFORMATION SCHEMA | NULL | GPL |
| INNODB_SYS_TABLES | ACTIVE | INFORMATION SCHEMA | NULL | GPL |
| INNODB_SYS_TABLESTATS | ACTIVE | INFORMATION SCHEMA | NULL | GPL |
| INNODB_SYS_INDEXES | ACTIVE | INFORMATION SCHEMA | NULL | GPL |
| INNODB_SYS_COLUMNS | ACTIVE | INFORMATION SCHEMA | NULL | GPL |
| INNODB_SYS_FIELDS | ACTIVE | INFORMATION SCHEMA | NULL | GPL |
| INNODB_SYS_FOREIGN | ACTIVE | INFORMATION SCHEMA | NULL | GPL |
| INNODB_SYS_FOREIGN_COLS | ACTIVE | INFORMATION SCHEMA | NULL | GPL |
| INNODB_SYS_TABLESPACES | ACTIVE | INFORMATION SCHEMA | NULL | GPL |
| INNODB_SYS_DATAFILES | ACTIVE | INFORMATION SCHEMA | NULL | GPL |
| INNODB_CHANGED_PAGES | ACTIVE | INFORMATION SCHEMA | NULL | GPL |
| partition | ACTIVE | STORAGE ENGINE | NULL | GPL |
| SEQUENCE | ACTIVE | STORAGE ENGINE | ha_sequence.so | GPL |
| CONNECT | ACTIVE | STORAGE ENGINE | ha_connect.so | GPL |
| QUERY_CACHE_INFO | ACTIVE | INFORMATION SCHEMA | QUERY_CACHE_INFO.so | BSD |
| QUERY_RESPONSE_TIME | ACTIVE | INFORMATION SCHEMA | query_response_time.so | GPL |
| METADATA_LOCK_INFO | ACTIVE | INFORMATION SCHEMA | metadata_lock_info.so | GPL |
| QUERY_RESPONSE_TIME_AUDIT | ACTIVE | AUDIT | query_response_time.so | GPL |
| SPHINX | ACTIVE | STORAGE ENGINE | ha_sphinx.so | GPL |
+-----------------------------+--------+--------------------+------------------------+---------+
50 rows in set (0.01 sec)
经过分析About Plugin，我发现了更多关于它的东西。我在深入解释。
What is plugins and How it is work?
MySQL 支持可以创建服务器组件的插件 API。插件可以在服务器启动时加载，也可以在运行时加载和卸载而无需重启服务器。 API 是通用的，没有指定插件可以做什么。该接口支持的组件包括但不限于存储引擎、全文解析器插件、服务器扩展。
例如，全文解析器插件可用于替换或扩充内置的全文解析器。插件可以使用不同于内置解析器使用的规则将文本解析为单词。如果您需要解析具有不同于内置解析器预期的特征的文本，这将很有用。
The plugin interface is more general than the older user-defined
function (UDF) interface.
How much plugin available for MySql? (Types of Plugins)
插件 API 可以创建实现多种功能的插件：
- 存储引擎
- 全文解析器
- 守护进程
- INFORMATION_SCHEMAtables
- 半同步复制
- 审计
- 身份验证
- 密码验证和强度检查
- 协议跟踪
- 查询重写
Can i add other plugins ? / If i can add then how to add ?
使用 INSTALL PLUGIN 语句安装的插件：
可以在运行时使用 INSTALL PLUGIN 语句加载位于插件库文件中的插件。该语句还在 mysql.plugin table 中注册插件，使服务器在随后的重新启动时加载它。因此，INSTALL PLUGIN 需要 mysql.plugin table.
的 INSERT 权限
mysql> INSTALL PLUGIN myplugin SONAME 'somepluglib.so';
正在卸载插件
在运行时，UNINSTALL PLUGIN 语句禁用并卸载服务器已知的插件。该语句卸载插件并将其从 mysql.plugin table 中删除（如果它已在此处注册）。因此，UNINSTALL PLUGIN 语句需要 mysql.plugin table 的 DELETE 权限。由于插件不再在 table 中注册，服务器将不会在后续重启时自动加载插件。
我正在 MySql 官方网站 (https://dev.mysql.com/doc/refman/5.1/en/partitioning.html) 探索分区。
在第一页，我找到了 plugins。
mysql> show plugins;
+----------------------------+----------+--------------------+---------+---------+
| Name | Status | Type | Library | License |
+----------------------------+----------+--------------------+---------+---------+
| binlog | ACTIVE | STORAGE ENGINE | NULL | GPL |
| mysql_native_password | ACTIVE | AUTHENTICATION | NULL | GPL |
| mysql_old_password | ACTIVE | AUTHENTICATION | NULL | GPL |
| sha256_password | ACTIVE | AUTHENTICATION | NULL | GPL |
| MyISAM | ACTIVE | STORAGE ENGINE | NULL | GPL |
| MRG_MYISAM | ACTIVE | STORAGE ENGINE | NULL | GPL |
| MEMORY | ACTIVE | STORAGE ENGINE | NULL | GPL |
| CSV | ACTIVE | STORAGE ENGINE | NULL | GPL |
| InnoDB | ACTIVE | STORAGE ENGINE | NULL | GPL |
| INNODB_TRX | ACTIVE | INFORMATION SCHEMA | NULL | GPL |
| INNODB_LOCKS | ACTIVE | INFORMATION SCHEMA | NULL | GPL |
| INNODB_LOCK_WAITS | ACTIVE | INFORMATION SCHEMA | NULL | GPL |
| INNODB_CMP | ACTIVE | INFORMATION SCHEMA | NULL | GPL |
| INNODB_CMP_RESET | ACTIVE | INFORMATION SCHEMA | NULL | GPL |
| INNODB_CMPMEM | ACTIVE | INFORMATION SCHEMA | NULL | GPL |
| INNODB_CMPMEM_RESET | ACTIVE | INFORMATION SCHEMA | NULL | GPL |
| INNODB_CMP_PER_INDEX | ACTIVE | INFORMATION SCHEMA | NULL | GPL |
| INNODB_CMP_PER_INDEX_RESET | ACTIVE | INFORMATION SCHEMA | NULL | GPL |
| INNODB_BUFFER_PAGE | ACTIVE | INFORMATION SCHEMA | NULL | GPL |
| INNODB_BUFFER_PAGE_LRU | ACTIVE | INFORMATION SCHEMA | NULL | GPL |
| INNODB_BUFFER_POOL_STATS | ACTIVE | INFORMATION SCHEMA | NULL | GPL |
| INNODB_METRICS | ACTIVE | INFORMATION SCHEMA | NULL | GPL |
| INNODB_FT_DEFAULT_STOPWORD | ACTIVE | INFORMATION SCHEMA | NULL | GPL |
| INNODB_FT_DELETED | ACTIVE | INFORMATION SCHEMA | NULL | GPL |
| INNODB_FT_BEING_DELETED | ACTIVE | INFORMATION SCHEMA | NULL | GPL |
| INNODB_FT_CONFIG | ACTIVE | INFORMATION SCHEMA | NULL | GPL |
| INNODB_FT_INDEX_CACHE | ACTIVE | INFORMATION SCHEMA | NULL | GPL |
| INNODB_FT_INDEX_TABLE | ACTIVE | INFORMATION SCHEMA | NULL | GPL |
| INNODB_SYS_TABLES | ACTIVE | INFORMATION SCHEMA | NULL | GPL |
| INNODB_SYS_TABLESTATS | ACTIVE | INFORMATION SCHEMA | NULL | GPL |
| INNODB_SYS_INDEXES | ACTIVE | INFORMATION SCHEMA | NULL | GPL |
| INNODB_SYS_COLUMNS | ACTIVE | INFORMATION SCHEMA | NULL | GPL |
| INNODB_SYS_FIELDS | ACTIVE | INFORMATION SCHEMA | NULL | GPL |
| INNODB_SYS_FOREIGN | ACTIVE | INFORMATION SCHEMA | NULL | GPL |
| INNODB_SYS_FOREIGN_COLS | ACTIVE | INFORMATION SCHEMA | NULL | GPL |
| INNODB_SYS_TABLESPACES | ACTIVE | INFORMATION SCHEMA | NULL | GPL |
| INNODB_SYS_DATAFILES | ACTIVE | INFORMATION SCHEMA | NULL | GPL |
| PERFORMANCE_SCHEMA | ACTIVE | STORAGE ENGINE | NULL | GPL |
| FEDERATED | DISABLED | STORAGE ENGINE | NULL | GPL |
| ARCHIVE | ACTIVE | STORAGE ENGINE | NULL | GPL |
| BLACKHOLE | ACTIVE | STORAGE ENGINE | NULL | GPL |
| partition | ACTIVE | STORAGE ENGINE | NULL | GPL |
+----------------------------+----------+--------------------+---------+---------+
42 rows in set (0.05 sec)
心里有一些疑问
- 什么是
plugins？ - 工作情况如何？
MySql有多少插件可用？- 我可以添加其他
plugins吗？ - 如果我可以添加那么如何添加？
这里是我安装的插件列表。还有很多。他们可以做很多事情。它们可以是存储引擎或处理用户功能或调度程序或...... 因此可以通过正常的 SQL and and and.
直接读取或写入 CSV 或 JSON 文件在这里你可以找到一些Informations
MariaDB > SHOW PLUGINS;
+-----------------------------+--------+--------------------+------------------------+---------+
| Name | Status | Type | Library | License |
+-----------------------------+--------+--------------------+------------------------+---------+
| binlog | ACTIVE | STORAGE ENGINE | NULL | GPL |
| mysql_native_password | ACTIVE | AUTHENTICATION | NULL | GPL |
| mysql_old_password | ACTIVE | AUTHENTICATION | NULL | GPL |
| CSV | ACTIVE | STORAGE ENGINE | NULL | GPL |
| MEMORY | ACTIVE | STORAGE ENGINE | NULL | GPL |
| MyISAM | ACTIVE | STORAGE ENGINE | NULL | GPL |
| MRG_MyISAM | ACTIVE | STORAGE ENGINE | NULL | GPL |
| Aria | ACTIVE | STORAGE ENGINE | NULL | GPL |
| PERFORMANCE_SCHEMA | ACTIVE | STORAGE ENGINE | NULL | GPL |
| InnoDB | ACTIVE | STORAGE ENGINE | NULL | GPL |
| XTRADB_READ_VIEW | ACTIVE | INFORMATION SCHEMA | NULL | GPL |
| XTRADB_INTERNAL_HASH_TABLES | ACTIVE | INFORMATION SCHEMA | NULL | GPL |
| XTRADB_RSEG | ACTIVE | INFORMATION SCHEMA | NULL | GPL |
| INNODB_TRX | ACTIVE | INFORMATION SCHEMA | NULL | GPL |
| INNODB_LOCKS | ACTIVE | INFORMATION SCHEMA | NULL | GPL |
| INNODB_LOCK_WAITS | ACTIVE | INFORMATION SCHEMA | NULL | GPL |
| INNODB_CMP | ACTIVE | INFORMATION SCHEMA | NULL | GPL |
| INNODB_CMP_RESET | ACTIVE | INFORMATION SCHEMA | NULL | GPL |
| INNODB_CMPMEM | ACTIVE | INFORMATION SCHEMA | NULL | GPL |
| INNODB_CMPMEM_RESET | ACTIVE | INFORMATION SCHEMA | NULL | GPL |
| INNODB_CMP_PER_INDEX | ACTIVE | INFORMATION SCHEMA | NULL | GPL |
| INNODB_CMP_PER_INDEX_RESET | ACTIVE | INFORMATION SCHEMA | NULL | GPL |
| INNODB_BUFFER_PAGE | ACTIVE | INFORMATION SCHEMA | NULL | GPL |
| INNODB_BUFFER_PAGE_LRU | ACTIVE | INFORMATION SCHEMA | NULL | GPL |
| INNODB_BUFFER_POOL_STATS | ACTIVE | INFORMATION SCHEMA | NULL | GPL |
| INNODB_METRICS | ACTIVE | INFORMATION SCHEMA | NULL | GPL |
| INNODB_FT_DEFAULT_STOPWORD | ACTIVE | INFORMATION SCHEMA | NULL | GPL |
| INNODB_FT_DELETED | ACTIVE | INFORMATION SCHEMA | NULL | GPL |
| INNODB_FT_BEING_DELETED | ACTIVE | INFORMATION SCHEMA | NULL | GPL |
| INNODB_FT_CONFIG | ACTIVE | INFORMATION SCHEMA | NULL | GPL |
| INNODB_FT_INDEX_CACHE | ACTIVE | INFORMATION SCHEMA | NULL | GPL |
| INNODB_FT_INDEX_TABLE | ACTIVE | INFORMATION SCHEMA | NULL | GPL |
| INNODB_SYS_TABLES | ACTIVE | INFORMATION SCHEMA | NULL | GPL |
| INNODB_SYS_TABLESTATS | ACTIVE | INFORMATION SCHEMA | NULL | GPL |
| INNODB_SYS_INDEXES | ACTIVE | INFORMATION SCHEMA | NULL | GPL |
| INNODB_SYS_COLUMNS | ACTIVE | INFORMATION SCHEMA | NULL | GPL |
| INNODB_SYS_FIELDS | ACTIVE | INFORMATION SCHEMA | NULL | GPL |
| INNODB_SYS_FOREIGN | ACTIVE | INFORMATION SCHEMA | NULL | GPL |
| INNODB_SYS_FOREIGN_COLS | ACTIVE | INFORMATION SCHEMA | NULL | GPL |
| INNODB_SYS_TABLESPACES | ACTIVE | INFORMATION SCHEMA | NULL | GPL |
| INNODB_SYS_DATAFILES | ACTIVE | INFORMATION SCHEMA | NULL | GPL |
| INNODB_CHANGED_PAGES | ACTIVE | INFORMATION SCHEMA | NULL | GPL |
| partition | ACTIVE | STORAGE ENGINE | NULL | GPL |
| SEQUENCE | ACTIVE | STORAGE ENGINE | ha_sequence.so | GPL |
| CONNECT | ACTIVE | STORAGE ENGINE | ha_connect.so | GPL |
| QUERY_CACHE_INFO | ACTIVE | INFORMATION SCHEMA | QUERY_CACHE_INFO.so | BSD |
| QUERY_RESPONSE_TIME | ACTIVE | INFORMATION SCHEMA | query_response_time.so | GPL |
| METADATA_LOCK_INFO | ACTIVE | INFORMATION SCHEMA | metadata_lock_info.so | GPL |
| QUERY_RESPONSE_TIME_AUDIT | ACTIVE | AUDIT | query_response_time.so | GPL |
| SPHINX | ACTIVE | STORAGE ENGINE | ha_sphinx.so | GPL |
+-----------------------------+--------+--------------------+------------------------+---------+
50 rows in set (0.01 sec)
经过分析About Plugin，我发现了更多关于它的东西。我在深入解释。
What is plugins and How it is work?
MySQL 支持可以创建服务器组件的插件 API。插件可以在服务器启动时加载，也可以在运行时加载和卸载而无需重启服务器。 API 是通用的，没有指定插件可以做什么。该接口支持的组件包括但不限于存储引擎、全文解析器插件、服务器扩展。
例如，全文解析器插件可用于替换或扩充内置的全文解析器。插件可以使用不同于内置解析器使用的规则将文本解析为单词。如果您需要解析具有不同于内置解析器预期的特征的文本，这将很有用。
The plugin interface is more general than the older user-defined function (UDF) interface.
How much plugin available for MySql? (Types of Plugins)
插件 API 可以创建实现多种功能的插件：
- 存储引擎
- 全文解析器
- 守护进程
- INFORMATION_SCHEMAtables
- 半同步复制
- 审计
- 身份验证
- 密码验证和强度检查
- 协议跟踪
- 查询重写
Can i add other plugins ? / If i can add then how to add ?
使用 INSTALL PLUGIN 语句安装的插件：
可以在运行时使用 INSTALL PLUGIN 语句加载位于插件库文件中的插件。该语句还在 mysql.plugin table 中注册插件，使服务器在随后的重新启动时加载它。因此，INSTALL PLUGIN 需要 mysql.plugin table.
的 INSERT 权限mysql> INSTALL PLUGIN myplugin SONAME 'somepluglib.so';
正在卸载插件
在运行时，UNINSTALL PLUGIN 语句禁用并卸载服务器已知的插件。该语句卸载插件并将其从 mysql.plugin table 中删除（如果它已在此处注册）。因此，UNINSTALL PLUGIN 语句需要 mysql.plugin table 的 DELETE 权限。由于插件不再在 table 中注册，服务器将不会在后续重启时自动加载插件。